Sejsf



J. C. FREDRICKSEN.

EXPLOSIVE ENGINE.

APPLICATION FILED MAY 5. 1917.

Patented Oct. 14, 1919.

John (Tf'reduickwen PATENT canton JOHN G. FREDRICKSEN, OF MILLER, INDIANA, ASSIGNOR 'IO JPHN C, FREDRICKSEN MANUFACTURING C0501? MILLER, INDIANA, A CORPORATION OF INDIANA.

EXPLOSIVE-ENGINE.

Application filed May 5. 1917.

To all whom it may concern: Be it known that 1, JOHN C. FREDRICK- snN, a citizen of the United States, and a character capable of operating with great efliciency.

The invention consists in the combinations and arrangements of parts hereinafter described and claimed.

The invention will be best understood by reference to the accompanying drawings forming a part of'this specification, and in which,

Figure l is a sectional view of an explosive engine operating on the two cycle principle embodyin my invention,

' Fig 2, a top plan view of the same, and

Fig. 3, a detail view of the cylinder head removed The form of construction illustrated in Figs. 1, 2 and 3 comprises a suitable crank case 5 having an engine cylinder 6 mounted thereon, the inner end 7 of said engine cylinder being reduced in size to substantially half the size of the main cylinder. A cylinder head 8 in the form of apiston is arranged to slide in the outer end of cylinder 6 being mounted upon a guide rod 9 operating through a guide 10, as indicated, compression spring 11 being interposed between cylinder head 8 and guide 10 and the parts being arranged to normally hold the cylinder head 8 in the neighborhood of the operative center of cylinder 6. A hollow piston 12 is arranged to operate in cylinder 6 and is provided with a reduced extension 13 open at its inner end 14 and operating as a piston in the cylinder extension 7. The piston 12-13 is operatively connected by one or more piston rods 15 with the usual crank shaft 16 mounted in the crank case 5. An inlet opening 17 is provided at the inner end of the cylinder extension 7 for connection with an ordinary carbureter for supplying the explosive mixture to the engine and air openings 18 are provided at the inner end of cylinder 6 to provide free access of air thereto. The plston 1213 is provided Specification of Letters Patent.

Patented 6a. 1a, was.

Serial No. 166606.

with a port 19 cooperating with a by-pass 20 in the wall of cylinder 6 in the usual manner to transfer explosive mixture in the cylinder 6 in the usual manner. A spark :plug 21 is located in the wall of cylinder 6 to register with the space between the cylinder head 8 and the piston 12 when both are at the outer ends of their movements.

, In operation, the explosive mixture is drawn into the cylinder extension 7 and compressed therein in the usual manner and passes into the cylinder 6 through the bypass 20 when the piston 1213 reaches the inner end of its stroke. On the compression stroke of the piston 12 the charge .is compressed against the cylinder head 8 which in turn is moved upwardly until it rests against the outer end of the cylinder, in which position the spark plug 21 will be in communication with the explosive charge. The charge is exploded by the spark plug 21 in the usual manner and causes operation of the piston in the usual manner. The charge is exhausted through the usual exhaust port 20 at the inner end of the stroke of the piston 12 the engine operating on the well known two cycle plan. By this arrangement complete scavenging of the cylinder 6 and complete combustion of the charge therein is assured. The complete scavenging is eflected due to the fact that the cylinder head 8 moves up to a position midway of the cylinder at the time of exhaust and at the same time a previously prepared charge of suf ficient volume to completely fill the fuel space of the cylinder is admitted under circumstances compelling the complete expulsion of the burnt gases. Thecomplete combustion of the charge is efiected by virtue of the fact that the same is ignited under heavy compression and a prolonged expansion of the burning gases obtained by virtue of the fact that the cylinder head 8 does not move up to exhausting position until exhaust takes place. The cylinder 6 is air cooled at both ends and the explosive charge is small' in relation to the other parts, thus dispensing with the. necessity for a water jacket in small sized engines. By this arrangement also, the explosive charge expands almost to atmospheric pressure thus tending to provide a noiselessly operating engine and inthe preferred forms of construction for carrying my invention into effect, these are capable of variation and modification without departing from the spirit of the invention. I, therefore, do not wish to be limlted' to the precise details of construction set forth, but desire to avail myself of such variations and modifications as come Within the scope of the appended claims.

Having described my invention What I claim as new and desire to secure by Letters Patent is: i

1. An explosive engine comprising a cylinder having a reduced coaxial extension leading therefrom and closed at its end opposite said cylinder; and a piston operating in said cylinder and having a reduced ex-- tension operating in said cylinder extension, said piston being hollow, open at the end operating in said extension, and provided with a port in the portion operating in said cylinder, there being a by-pass in the walls of said'cylinder arranged to transfer the charge from said piston through said port into said cylinder, there being a charge ininder, there being a by-pass'in the walls of said cylinder arranged to transfer the charge from said piston through said port into said cylinder, there being a charge intake at the inner end of the reduced portion of said cylinder, and an air opening leading into the end of said cylinder adjacent said cylinder extension, substantially. as described.

3. An explosive engine comprising a cyl= inder having a reduced coaxial extension in open communication therewith but closed at n the end opposite said cylinder; a piston operating in said cylinder and having a reduced coaxial extension operating, in said cylinder extension, said piston f being hollow, open at its inner end and provided with a port in its outer portion, there being a bypass in the walls of said cylinder arranged to transfer the charge from said piston through said port into said cylinder, there.

being a charge intake at the inner end of the reduced portion of said cylinder, and an air opening at the inner end of said cylinder; a cylinder head in the form of a piston sliding in said cylinder; and yieldable means for normally holding said cylinder head in the neighborhood of the normal operative center of said cylinder, substantially as described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing Witnesses.

'JOHN C; FREDRICKSEN.

Witnesses: JOSHUA R. H. Po'r'rs, B. G. RICHARDS. 

